Artificial tooth and crown.



0. W. PLUMLBY. I ABTIFIGIAL TOOTH AND GROWN.

APPLICATION FILED T13R26, 1910.

963,648. Patented July 5,1916.

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7 arm UNITED srrarwnn crate CHARLES w. PLUMLEYI, or PARKERSBURG, WEST VIRGINIA.

ARTIFICIAL TOOTH AND GRUWN.

if i I I To all whom'tt concern: Be it known that I, CHARLES W. l 'noiiimzy, a citizen of the United States, residing 'Parkersburg, in the county of Wood and State of West Virginia, have invented new .and useful Improvements in Artificial Teeth and Crowns, of which the following is a specification.

.This invention relates to artificial teeth or or-owns and means for attaching the same,

one objectofthe invention being to provide a construction of tooth or crown and backing insuring increased strength and durability, greater economy 1n preparing and fiIllShlIl a bridge, and greater ease and facility in fastening the tooth to the backing andreplacing the same with a new tooth in the event of breakage.

A further object is to provide a construction whereby the exposure of metallic parts will be avoided, the teeth rendered readily detachable and.interclnmgeablc, and all liability of injury to the teeth in fastening them to the backing prevented.

The invention consists of the features of construction, combination and arrangement of parts, hereinafter fully described and claimed, reference being had to the accompanying drawings, in which Figure 1 is a vertical section of an artificial tooth embodying one form of my invention, showing it applied to the backing plate. Fig. 2 is a side view of the backing late. Fig. 3 is a vertical section of another "orm of artificial tooth applied to its backing. Fig. 4 is a side view of the backing plate thereof. Fig. 5 is aplan view of a backing plate for molar teeth. Fig. 6 is a view similar to Fig. 1, showing a further modification.

Referring to Figs. 1 and 2 of the drawings, 1 designates the body or cusp of an artificial tooth embodying my invention, and 2 the tooth front which projects upwardly from the upper front portion of said body 1. The upper rear surface of the body or cusp 1 is provided with a face or seat 3 for the backing plate 4, and formed in said body or cusp is a socket 5 receiving the backing post (hextending from the plate l, which post may be riveted or otherwise secured to the "plate in any suitable manner and made with 'the plate of gold or other metal, or the post Specification of Letters Patent.

Application filed February 2c, 1910. Serial an.

Patented July 5, 1916). 546,062.

ward and forward angle on a line above the direct line leading to the cutting edge of the tooth, and opens through the seat at a point somewhatfabove the center thereof and between the same and the lower end of the rear face of the front tooth, at the point of intersection of which with the backing face an angle or shoulder T is formed.

The seat 3 and backing plate 4 are longitudinally curved or have their upper and lower portion above and below the central transverse line of the socket disposed atan angle to each other, whereby said seat and plate are strengthened to effectually withstand. the strains falling upon the tooth. Preferably, as shown, the curve or bend in the seat and plate are more pronounced at a point substantially in line with the lower surface of the post, by which the concavity formed by the rear surface of the plate is deepened or in effect recessed at an intermediate point to provide a greater space for the reception of solder, thus enabling the plate to be more firmly and securely tastcncd to the bridge.

In practice, the backing plate is soldered or fastened to the bridge in any approved manner and the tooth cemented to the plate and post, the arrangement of the seat face and socket being such that a maximum thickness of the porcelain forming the tooth is provided between said face and socket and the front surface of the toothto prevent any possibility of the latter being discolored by the cement employed. The upper edge of the backing plate bears against the shoulder 7, and owing to the form and arrangement of the seat and backing it will be apparent that any tendency of the tooth totilt or cant upon the post will be offectually resisted while the longitudinal strain upon the tooth will be transmitted,

at such an angle as to form a truss connection between the backing and bridge, whereby the lattcr isadapted to withstand the imposed pressure without liability of injury. This action is promoted by the arrangement of the upwardly extending front 2 relative to the inclined seat 3, said front acting in the nature of a. reinforcing extension to bear a portion of the strain.

liy securing the tooth to the backing in the manner described, it will be seen that said tooth may be fastened to the bridge in a ready and convenient manner, and detached and a new tooth'nsvoliweniently subdownward angle from the upper rear por- BEST AVAILABLE COPY stituted therefor in case of breakage. The mode of mounting obviates the necessity of molding anchoring devices of any kind within the tooth by which the strength of the tooth is liable to be impaired, and also the necessity of using reinforcing connections between the backii'ig and tooth, although under some conditions a reinforcement of thin gold may be soldered to the backing and burnished over the neck of the tooth to give increased stability. The tooth may however, through the construction described, be lirmly fastened to the backing without additional connection, thus a\oid ing the necessity of having gold or other metal showing in the linished bridge.

The construction described may be can ployed generally for all kinds of artificial teeth but particularly for canine and inclsors.

In Figs. 3 and -l-, I have shown a modified form of the construction designed to give additional strength, in which construction the body portion of the tooth is provided with a rear extension 8 projecting at a.

tion thereof, the upper face of said extension increasing the length of the seat 8 to all'ord a lirmer b aring for the backing plate 4-, the lower edge of which may engage a. shoulder 11 provided upon the extension, whereby the plate will be more firmly locked or anchored in position. The same general construction is employed tor artificial molar teeth, each cusp of which, however. will be. provided with a receiving socket for use in conjunction with a backinn plate 4" of the form shown in Fig. 5. said plate having a pair of posts (3 to enter the sockets.

in some ta-ie the seat Il may be disposed at an oblique angle more sharply pronounced to the inner face of the'front and the backing plate =l" may be provided l with an upward extension 4 bent atan angle to rest against said face of the front, as shown in Fig. 6.

Having described my inventioinll claim 1. An artificial tooth comprising a body portion having a front extending from its forward edge, the rear surface of said body portion being sharply beveled at an outward and downward angle to provide a seat, and an angular shoulder at the juncture of said front and seat, and said body portion having a socket inclining downwardly and forwardly from said seat, at a point below said shoulder and on a line above a direct line between the mouth of the socket and cutting point of the teeth, and a latching plate of uniform thickness curved to conform to and rest against the seat and hear at its upper end agaipst said shoulder and provided with a post to project into said socket, said tooth being adapted to be secured by cement to the plate and post.

2. An artilicial tooth comprising a body portion having a front extending from its forward edge, the rear surface of said body portion being downwardly and outwardly beveled to provide a seat, and said body portion having a socket inclining down- \vardly and forwardly from said scat, said socket opening through the scat between the central transverse line of the seat and the base of the front. and a backin; plate adapted to rest against said seat and hear at its upper edge against the hase of the front, said plate being provided with a post to extend into said socket;

ln testimony whereof 1 allix my signature in presence of two witnesses.

( l lQXlllJES XV. PLUA'ILE Y.

Witnesses:

lhcx T. NEAL, Jim, 1*). ll. \Vruanaxo. 

